Completed
Last Updated: 13 Aug 2026 12:11 by ADMIN
Release 2026 Q3
Accessing the e.UploadResult from the FileUploadedEvent while using custom handlers throws InvalidOperationException "This type is not allowed"
Completed
Last Updated: 31 Jul 2026 14:10 by ADMIN
Release 2026 Q3
ADMIN
Created by: Rumen
Comments: 1
Category: Editor
Type: Bug Report
1
The Bold, Italic, Underline, Justify, Indent, Outdent and other commands are not localized in the Undo/Redo dropdowns.

Screenshots:

https://www.screencast.com/t/YLNTiPP7LAk

https://www.screencast.com/t/DS9Y6GrB 


Can be seen at http://demos.telerik.com/aspnet-ajax/editor/examples/localization/defaultcs.aspx. 
Completed
Last Updated: 31 Jul 2026 13:56 by ADMIN
Release 2026 Q3
If you type 15 into the font size combo box and click away, a Javascript error is thrown and the font size of the selected cell does not change. If instead you type 16 and click away, the cell changes correctly. 16 is an option in the drop-down but 15 is not.

Error message:

RadSpreadsheetScripts.js:196 Uncaught TypeError: Cannot read property 'get_text' of null


The font size combo box works correctly in the Kendo spreadsheet demo (both with the current and the 2017.1.124 Kendo version ). You can also press enter to commit your typed font size in the Kendo widget, but not in RadSpreadsheet.

Steps to reproduce:
1. Open https://demos.telerik.com/aspnet-ajax/spreadsheet/examples/overview/defaultcs.aspx
2. Click inside the font -size dropdown
3. Type 15 and click outside the SpreadSheet

Result: A JavaScript error is thrown.
Completed
Last Updated: 28 Jul 2026 12:59 by ADMIN
Created by: Francesco
Comments: 2
Category: Grid
Type: Bug Report
2

Good morning,

we have a strange issue using RadGrid with horizontal scroll and frozen columns: there a resizing of the height which gets user experience not the best.

See attached gif.

 

Could you please help us?

Completed
Last Updated: 28 Jul 2026 05:26 by ADMIN

Please create a method that will convert the old expressions to new format and make them re-usable again.

Completed
Last Updated: 22 Jul 2026 10:16 by ADMIN
Release 2026 Q3
Created by: Krzysztof
Comments: 0
Category: PersistenceFramework
Type: Bug Report
1
After after update to Telerik UI for ASP.NET AJAX 2026.2.708 we have problem with RadPersistenceManager1.LoadState() metod.
Error: System.InvalidOperationException: This type is not allowed.
We use custom StorageProvider for RadPersistenceManager that implements the IStateStorageProvider interface.

Everything works great on version Telerik UI for ASP.NET AJAX 2026.2.519 (2026 Q2).
Completed
Last Updated: 10 Jul 2026 08:17 by ADMIN
Release 2026 Q3

If both the CSRF validation and the Session state is turned off, the pages containing AsyncUpload control will throw a null reference exception.

<appSettings>
  <add key="Telerik.AsyncUpload.EnableCsrfValidation" value="false" />
</appSettings>
<system.web>
  <sessionState mode="Off" />

Completed
Last Updated: 06 Jul 2026 06:41 by ADMIN
Release 2026 Q3
ADMIN
Created by: Plamen
Comments: 1
Category: PanelBar
Type: Bug Report
1

			
Completed
Last Updated: 30 Jun 2026 10:07 by ADMIN
Release 2026 Q2 SP1
Created by: Emin Sadigov
Comments: 2
Category: Editor
Type: Bug Report
1

In the demo:
https://demos.telerik.com/aspnet-ajax/editor/examples/trackchanges/defaultcs.aspx

 

1. (Preparation) Disable TrackChange and Remove all text. Enable Track Change back.

2. Insert table, (HTML View)

3. In the design mode set new paragraph after table:

 

Insertion of the table dissapeared.

How to fix this issue?

Completed
Last Updated: 30 Jun 2026 08:06 by ADMIN
Release 2026 Q2 SP1

We are encountering an issue with the RadListBox control (version 2026.1.225) where the container's scroll position abruptly jumps back to 0 when an item is selected. Tested with Edge, Chrome and Firefox. This issue can be reproduced directly on the official Progress live demo page.

Steps to reproduce:
  1. Open the demo page linked above.
  2. Scroll down to the bottom of the RadListBox using only the mouse wheel.
  3. Click on any item (e.g., "USA") to select it.

Observed behavior:

Immediately upon clicking the item, the container's scroll position snaps back to 0 (the top of the list). This happens consistently across all modern browsers (Edge, Chrome, and Firefox).

Important factual details regarding the scrollbar:
  • The issue does not occur if the user clicks and drags the scrollbar thumb with the left mouse button before selecting an item.
  • The issue does not occur if the user clicks the top or bottom navigation arrows on the scrollbar container to scroll.
  • The unexpected reset to 0 only triggers when scrolling is performed exclusively via the mouse wheel prior to item selection.
Please let us know if there is an official hotfix or an updated internal build available that resolves this scrolling state synchronization issue.
Completed
Last Updated: 29 Jun 2026 14:59 by ADMIN
Release 2026 Q2 SP1

Reproduction - http://somup.com/crVYIDot19

Setup to reproduce:

<telerik:RadContextMenu ID="RadContextMenu1" runat="server">
    <Targets>
        <telerik:ContextMenuDocumentTarget />
    </Targets>
    <Items>
        <telerik:RadMenuItem Text="item">
            <ItemTemplate>
                <asp:TextBox ID="TextBox2" runat="server" />
            </ItemTemplate>
        </telerik:RadMenuItem>
    </Items>
</telerik:RadContextMenu>

<telerik:RadButton runat="server" ID="RadButton2" Text="Postback" AutoPostBack="true" />

Steps to reproduce:

  • Show the context menu with a right mouse click on the document.
  • Type in a custom value in the TextBox embedded in the menu.
  • Perform a postback by clicking on the RadButton.
  • Show the context menu again. In the textbox, pick the autocomplete suggestion by the browser.
Completed
Last Updated: 29 Jun 2026 11:31 by ADMIN
Release 2026 Q2 SP1

I'm using a RadTab and one of the RadPageViews starts with an RadAsyncUpload-Control. When I use arrow keys to select this tab and try to use the Tab-Key to focus the next element (the RadAsyncUpload in this case) nothing happens. If any other control (like a textbox) is placed above my upload control there is no problem focusing it.

You can see this in the attached Demoproject when using arrow keys to select to RpvUpload.

Completed
Last Updated: 23 Jun 2026 07:25 by ADMIN
Release 2026 Q2 SP1
Created by: Fit2Page
Comments: 0
Category: NumericTextBox
Type: Bug Report
0

After updating to 2026.2 the layout of the SpinButton changed. To work around it, use the below CSS:

html body .RadInput .riUp,
html body .RadInput .riDown {
    height: 50%;
}

 

Completed
Last Updated: 05 Jun 2026 13:29 by ADMIN
Release 2026 Q2 SP1
ADMIN
Created by: Vessy
Comments: 1
Category: ColorPicker
Type: Bug Report
0
RadColorPicker remains clickable when its set_enabled(false) method is called.

Steps to reproduce:
1. Run this code:

        <telerik:RadColorPicker ID="RadColorPicker1" runat="server" ShowIcon="true" ShowEmptyColor="false" RenderMode="Lightweight" />
        <br /><br /><br />
        <select id="mySelect" onchange="EnableDisableColorPicker()">
            <option value="1">1</option>
            <option value="2" selected="selected">2</option>

        </select>
        <script>
            function EnableDisableColorPicker() {
                var x = document.getElementById("mySelect").value;
                var colorPicker = $find("<%= RadColorPicker1.ClientID %>");
                if (x == 1) {
                    colorPicker.set_enabled(false);

                } else {
                    colorPicker.set_enabled(true);

                }
            }
        </script>

2. Select option 1.

Result: RadColorPicker gets disabled, but remains clickable
Completed
Last Updated: 04 Jun 2026 12:28 by ADMIN
Release 2026 Q2 SP1

When attempting to view the page in design view, here's what it looks like:

 

Here is the markup:

    <telerik:RadPanelBar ID="RadPanelBar1" runat="server">
        <Items>
            <telerik:RadPanelItem runat="server" Expanded="True" PreventCollapse="true">
                <HeaderTemplate>
                    <div ID="content-header">
                        Auditing Report | GPO Changes For User
                    </div>
                </HeaderTemplate>
                <ContentTemplate>
                    <div ID="content-body">
                        <telerik:ReportViewer ID="ReportViewer1" runat="server" ReportBookID="" Width="100%" Height="12in">
                        </telerik:ReportViewer>
                    </div>
                </ContentTemplate>
            </telerik:RadPanelItem>
        </Items>
    </telerik:RadPanelBar>

Completed
Last Updated: 04 Jun 2026 10:02 by ADMIN
Release 2026 Q2 SP1

After upgrade an infinite "Loading..." is displayed when using load on demand:

<telerik:RadComboBox
    ID="ddlOldValues"
    runat="server"
    Filter="Contains"
    AllowCustomText="true"
    ShowMoreResultsBox="true"
    EnableLoadOnDemand="true"
    ItemsPerRequest="10"
    EnableVirtualScrolling="true"
    DataTextField="USERFULLNAME"
    DataValueField="USERFULLNAME">
    <WebServiceSettings Method="GetDynamicUsersUS" Path="WebService.asmx" />
</telerik:RadComboBox>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
[System.Web.Script.Services.ScriptService]
public class WebService : System.Web.Services.WebService
{
    [WebMethod(EnableSession = true)]
    public RadComboBoxData GetDynamicUsersUS(RadComboBoxContext context)
    {
        RadComboBoxData comboData = new RadComboBoxData();

        try
        {
            DataTable data = GetUsersData();
            string filter = "USERFULLNAME LIKE '%" + context.Text + "%'";
            data.DefaultView.RowFilter = filter;
            DataTable dtData = data.DefaultView.ToTable();

            if (dtData == null || dtData.Rows.Count == 0)
            {
                dtData = data;
            }

            // Exact same GetComboData logic as frmBRMultipleUpdate.aspx.vb
            int itemsPerRequest = 10;
            int itemOffset = context.NumberOfItems;
            int endOffset = itemOffset + itemsPerRequest;

            if (endOffset > dtData.Rows.Count)
            {
                endOffset = dtData.Rows.Count;
            }

            // When data is exhausted, set EndOfItems to true
            if (itemOffset >= dtData.Rows.Count)
            {
                comboData.EndOfItems = true;
                comboData.Items = new RadComboBoxItemData[0];
                return comboData;
            }

            comboData.EndOfItems = (endOffset >= dtData.Rows.Count);

            var result = new List<RadComboBoxItemData>();
            for (int i = itemOffset; i < endOffset; i++)
            {
                var item = new RadComboBoxItemData();
                item.Text = dtData.Rows[i]["USERFULLNAME"].ToString();
                item.Value = dtData.Rows[i]["USERFULLNAME"].ToString();
                result.Add(item);
            }

            comboData.Items = result.ToArray();
            comboData.Message = string.Format("Items <b>{0}</b>-<b>{1}</b> out of <b>{2}</b>",
                itemOffset + 1, endOffset, dtData.Rows.Count);
        }
        catch (Exception ex)
        {
            comboData.Message = "No matches";
        }
        return comboData;
    }

    private static DataTable GetUsersData()
    {
        DataTable dt = new DataTable();

        dt.Columns.Add(new DataColumn("USERFULLNAME", typeof(string)));
        dt.Columns.Add(new DataColumn("EMAIL", typeof(string)));

        for (int i = 0; i < 200; i++)
        {
            int index = i + 1;

            DataRow row = dt.NewRow();

            row["USERFULLNAME"] = "User" + index;
            row["EMAIL"] = "user" + index + "@example.com";

            dt.Rows.Add(row);
        }

        return dt;
    }
}

To work-around it, set a Height to the ComboBox:

<telerik:RadComboBox
    Height="300px"
    ID="ddlOldValues"
    ...

 

 

Completed
Last Updated: 03 Jun 2026 12:49 by ADMIN
Release 2026 Q2 SP1
ADMIN
Created by: Plamen
Comments: 1
Category: DropDownTree
Type: Feature Request
3

			
Completed
Last Updated: 03 Jun 2026 12:42 by ADMIN
Release 2026 Q2 SP1
Created by: Frank
Comments: 1
Category: ColorPicker
Type: Bug Report
2

There are missing keys in the resx files and the resource files are not applied correctly. More info here: 

Completed
Last Updated: 03 Jun 2026 12:41 by ADMIN
Release 2026 Q2 SP1

Hover over the command arrows on the radScheduler when the view is set to month view.  The Tooltip will display "next day" and "previous day" instead of "next month" and "previous month".

The same happens for week view.

Temporary workaround: 

<telerik:RadCodeBlock runat="server">
    <script>
        function pageLoadHandler() {
            var scheduler = $find("<%= RadScheduler1.ClientID %>");
            var $scheduler = $telerik.$(scheduler.get_element());
            var viewType = "Day";
            if (scheduler.get_selectedView() == Telerik.Web.UI.SchedulerViewType.WeekView) {
                viewType = "Week";
            } else if (scheduler.get_selectedView() == Telerik.Web.UI.SchedulerViewType.MonthView) {
                viewType = "Month";
            }

            $scheduler.find(".rsPrevDay").attr("title", "Previous " + viewType)
            $scheduler.find(".rsNextDay").attr("title", "Next " + viewType)

            // Sys.Application.remove_load(pageLoadHandler);  
        }
        Sys.Application.add_load(pageLoadHandler);
    </script>
</telerik:RadCodeBlock>

Completed
Last Updated: 01 Jun 2026 11:05 by ADMIN
Release 2026 Q2
Problem:

In the RadEditor we have the NewLineMode set to Div
We are also using a ToolsFile xml document to control the tools available in RadEditor.
The problem is the InsertParagraph tool now inserts <div> tags instead of <p> tags.
We want to keep the NewLineMode behavior as DIV while still having a tool that can insert a paragraph (i.e. a <p> tag).

To replicate this problem:

On the RadEditor demo page, first set "NEW LINES AS" to "Divs".
Then, in the editor content area just above the "Destinations" table, Type in three lines:
Comment1
Comment2
Comment3

If you then toggle to the HTML tab, you will see that the Comment1 line is (incorrectly) bracketed by a <p> tag while the Comment2 and Comment3 lines are (correctly) bracketed by <div> tags.

Next, go back to the Design tab and position yourself at the beginning of the Comment3 line then click the [Insert Paragraph] button.

In the newly inserted "paragraph" type "Comment2b".

If you then toggle to the HTML tab you will see that Comment2b is incorrectly bracketed by a <div> tag.  It should be a <p> tag.

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